The dry season is generally the best time to do a trek anywhere in Latin America. In Peru the dry season usually runs from April to November, while the wet season runs from December to March. The Inca Trail is closed in February.June to September are the most popular months for treks in Peru (plan ahead for treks during these months, especially the Inca Trail which can sell out 6 months in advance). May and October can be great months for trekking, as weather is nice and it is less crowded. Even during the rainy season it doesn’t usually rain all day long, and you can have a pleasant, yet damp, trek.